The datasource for your webapp isn't setup correctly. Take a look at
http://tomcat.apache.org/tomcat-5.5-doc/jndi-datasource-examples-howto.html
for help on how to properly setup a database connection pool. My only
edit that article I would recommend is don't add ?autoReconnect=true to
the end of the mysql database url. Instead, add validationQuery="select
1" to the <Resource ... /> element in your context.xml file so
connections are tested and regenerated as needed.
--David
sam wun wrote:
HI there,
I managed to fix the jdk version error, now it comes with a different
error.
The url I am trying to put on the firefox browser is
http://10.1.9.1:8080/DBTest/CreateCustomerServlet
The error is:
TTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it
from fulfilling this request.
exception javax.servlet.ServletException: Cannot create JDBC driver of
class '' for connect URL 'null'
servlet.CreateCustomerServlet.doGet(CreateCustomerServlet.java:38)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create
JDBC driver of class '' for connect URL 'null'
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1150)
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
command.CommandExecutor.getConnection(CommandExecutor.java:54)
command.CommandExecutor.executeDatabaseCommand(CommandExecutor.java:38)
servlet.CreateCustomerServlet.doGet(CreateCustomerServlet.java:33)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause java.sql.SQLException: No suitable driver
java.sql.DriverManager.getDriver(Unknown Source)
org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143)
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
command.CommandExecutor.getConnection(CommandExecutor.java:54)
command.CommandExecutor.executeDatabaseCommand(CommandExecutor.java:38)
servlet.CreateCustomerServlet.doGet(CreateCustomerServlet.java:33)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache
Tomcat/5.5.26 logs.
----- Original Message -----
From: David Smith
Sent: 28/08/08 12:44 am
To: Tomcat Users List
Subject: Re: Can't execute servlet project
Looks normal .. you won't get a file named CreateCustomerServlet under
DbTest. You should get a class named CreateCustomerServlet.class in
WEB-INF/classes/servlet. That class will be called when your webapp
receive's a request for
http://localhost:8080/DbTest/CreateCustomerServlet (assuming tomcat was
installed with listening on port 8080 and it's installed on your local
workstation). That's what the <servlet-mapping> ... </servlet-mapping>
part of web.xml is all about -- mapping URLs to servlets.
--David
sam wun wrote:
I got a similar web.xml, but the is different.
Here is the entire content of my web.xml.
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";>
<display-name>
DBTest</display-name>
<servlet>
<description>
Servlet to create customers</description>
<display-name>
CreateCustomerServlet</display-name>
<servlet-name>CreateCustomerServlet</servlet-name>
<servlet-class>
servlet.CreateCustomerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CreateCustomerServlet</servlet-name>
<url-pattern>/CreateCustomerServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
However, I don't see "CreateCustomerServlet" copied into my DBTest
folder
in the linux(tomcat) server.
Here is the project directory listing of my tomcat server (in linux):
linux:~/tomcat/apache-tomcat-5.5.26/webapps/DBTest # ls
. .. META-INF WEB-INF customers.jsp
Thanks
Sam
----- Original Message -----
From: David Smith
Sent: 27/08/08 11:29 pm
To: Tomcat Users List
Subject: Re: Can't execute servlet project
But if you followed the tutorial, there should be a servlet mapping in
your web.xml looking like what I copied and pasted from the article
below:
<servlet>
<description>Create Customers Servlet</description>
<display-name>ListCustomers</display-name>
<servlet-name>ListCustomers</servlet-name>
<servlet-class>servlet.ListCustomersServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ListCustomers</servlet-name>
<url-pattern>/ListCustomers</url-pat-tern>
</servlet-mapping>
This defines a servlet in the <servlet> element and then defines the
URLs this servlet should service in the <servlet-mapping> element. In
this case there doesn't need to be a physical file named ListCustomers
in the top level of the DbTest webapp.
Your tutorial was very much geared to showing you how Eclipse works,
more or less assuming you had some familiarity with servlet and/or
java
programming. I would recommend finding some tutorial material that
focuses on servlet/jsp programming, ignoring IDEs like Eclipse.
--David
sam wun wrote:
HI there,
It sounds logical, but there is no LIstCustomers in the DBTest
folder.
Thanks
Sam
----- Original Message -----
From: David Smith
Sent: 27/08/08 09:59 pm
To: Tomcat Users List
Subject: Re: Can't execute servlet project
I see .... the jsp is a view and as such wasn't designed to be run
on
it's own. Try http://localhost/DBTest/ListCustomers in your
browser.
That should hit the servlet which in turn should generate the
required
bean and forward the user to your jsp.
--David
sam wun wrote:
Hi, thanks for trying to help.
I dont' have a clue on this *bean*.
The entire tutorial doesn't mention about how to setup a bean...
The tutorial I;ve followed is shown as below:
http://java.sys-con.com/node/152270
Thanks
Sam
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--
David Smith
Programmer/Analyst
College of Agriculture and Life Sciences
Cornell University
B32 Morrison Hall
Ithaca, NY 14853
Phone: (607) 255-4521
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